Malicious PDF — malware analysis report

Static analysis result for SHA-256 d528a589a5845d74…

MALICIOUS

PDF

84.9 KB Created: 2021-09-21 05:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 582f871fbdc5b4a2742ca6e0ffe68f04 SHA-1: fe5dd475f2378192e972a237d78f1be4ce4726c4 SHA-256: d528a589a5845d74845fdb33b4a839f2e254dbb31a90ae4e1052d7c97156d087
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The PDF structure and embedded content indicate it is designed to redirect users to potentially harmful websites, likely as part of a phishing campaign or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://mallenmediations.com/mallenmediations/images/userfiles/file/51808866462.pdf In PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144860e60d63---petamipitepejesefixovof.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/517512670613731e111391.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/5783656884.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16140487821cee---63468138172.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/perexefeporaziboxoged.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210921_012832_6867.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/55862338712.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/wazumolukuvigewojiguroda.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/xinavumedewofefivareva.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/11439917953.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/dazefodafi.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/97362351564.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/4909353419.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/36574120087.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/busizumugimupuwepu.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/puruxefapodewarekeluzo.pdfIn PDF document text
    • http://suaups.net/userfiles/file/ximunikopel.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/60332554347.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/runifeku.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/57506957952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mulan+2020+online+stream+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 17644 bytes
SHA-256: ffd7609de80ddf027639dbec48933125f4178c82536c3c87a4f813efd154ae41
font_01_sfnt_off0001154e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 10708 bytes
SHA-256: 674de358b95d5e0538a77db6d2884d6ed9ce00146d0b1828878fe79fcfe8db2c
font_02_sfnt_off00012df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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